Python: Display Words Ending with a Digit (Solved)

Practice Question 26

In this question, we will learn how to write a function that extracts words that end in a number, such as “User1”, “Batch2026”, or “Point5”.

The Logic (How it works)

Before writing the code, let us first understand the logic behind the solution.

To check the end of a word, we use Python’s powerful negative indexing:

• Read and Split: We open info.txt and break the content into individual words.

• Target the Last Character: In Python, word[-1] always refers to the very last character of a string, no matter how long the word is.

• The isdigit() Check: We apply the .isdigit() method to only that last character.

• Display: If the condition is met, we print the word.

Let’s Code as per the above logic :

def displayWordsEndingWithDigit():
    f = open("info.txt", "r")
    data = f.read()
    wordlist = data.split()
    
    print("Words ending with a digit:")
    for word in wordlist:
        # Check if the word is not empty and the last character is a digit
        if word and word[-1].isdigit():
            print(word)
            
    f.close()

# To call the function:
displayWordsEndingWithDigit()

Important Notes for Students

As a teacher, I want you to focus on these three key points so you don’t lose marks:

• • Negative Indexing: Using word[-1] is much better than using word[len(word)-1]. It is cleaner, faster, and follows Python’s “best practices.”

  • Safety Check: Notice the if word and ... part. This ensures that if there are empty strings in your list (which can happen with certain splitting scenarios), the program won’t crash when trying to access index -1.

  • Digits vs. Numbers: Remember that isdigit() checks for a single character (0-9). If the word ends in “123”, word[-1] will correctly identify ‘3’ as a digit.

Teacher’s Secret Tip for Exams:

If the examiner asks for words Starting with a digit, simply change word[-1] to word[0]. The rest of the logic remains exactly the same!

Want to practice more? If you found this helpful, I have compiled a full list of 30 practice problems just like this one. Each question focuses on a different logic to help you become a pro at File Handling.

Click here to view the full 30-Question Practice Set

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